Keep in mind these bulbs are polarity specific and must be wired with the positive battery connection to the center contact of the bulb and negative to the threads.
Also monitor battery voltage and check connections periodically as low voltage and poor connection are the primary cause of premature CF bulb failure. All have a standard Edison base like an ordinary household lightbulb except #CCD-134000H.
CAUTION - Use only with 12 volts DC. Do not connect to higher voltage or alternating current. Buy only if you know what you are doing. By completing a purchase you agree that you are responsible for observing the safety/electrical/building codes that apply.